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Date: Thu, 19 Dec 2002 00:30:57 +0100
From: Torben Frey <kernel@mailsammler.de>
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To: Andrew Morton <akpm@digeo.com>
CC: Con Kolivas <conman@kolivas.net>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Horrible drive performance under concurrent i/o jobs (dlh problem?)
References: <1040245847.3e00e457a4d66@kolivas.net> <3E00F3B4.7050209@mailsammler.de> <3E00F894.BDAB4E05@digeo.com>
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Hi Andrew, hi Con,

> Here's a diff against base 2.4.20.  It may be a little out of date
> wrt Andrea's latest but it should tell us if we're looking in the
> right place.
Ok, I did not run the complete 2.4.20aa1 kernel yet since I am not sure 
if it is intended to be used, but I applied your patch, Andrew (thanks 
for mailing it). It still does not fix the problem. One job doing much 
I/O starts with about 80% CPU but then drops down to about 30% in the 
first 40 seconds. Load goes from 0.00 to 2.4 within that time.

And I can see bdflush and my process marked with "D" in the process list.

Catting the device to /dev/null only made it worse :-(

Creating a 1GB file using dd takes about 1 minute compared to 16 seconds 
without other jobs running.

Do you think it could be a ReiserFS problem on a RAID? Do you know of 
anything else I could try? Sorry, but my knowledge doesn't reach that far.

TIA,
Torben

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